More DIY EGOR

[944 at technologist.com]

Am I understanding this correctly? The goal of the heater is to maintain the
heater element at a constant resistance (say 3.5 ohms) . If the resistance
of the heater remains constant, than the heating element is assumed to be
keeping the sensor at a constant temperature. Is that correct?

FR Wilk
_____________________________

>I don't see any reason why not.  my only question is if it is needed or
>not.  if the temp is being maintained well enough that the sensor gives
>accurate data then why add more hardware & i think more importantly why add
>another level of complication?
>
>sounds to me like the temp control that is in that temp driver circuit SB
>OK.
>
>BW
>
>
>
>> [Original Message]
>> From: 944 Technologist <944technologist at my-deja.com>
>> To: <diy_efi at diy-efi.org>
>> Date: 11/18/00 12:17:08 AM
>> Subject: Re: More DIY EGOR
>>
>> Is adding a Temp Sensor out of the Question? Does it violate the design
>criteria for some reason. Cost? Mechanical, only one hole aloud in the
>exhaust pipe? I only subscribed again a few months ago.
>>
>> If not, you could use it and a ROM lookup table to display accurate
>Lambda values. Using measured Lambda and Temperature as your X & Y values.
>The table would have the corrected Lambda values.
>>
>> FR Wilk
>> __________________________________
>>
>> >From: RDwoo10 at aol.com
>> >Date: Sat, 18 Nov 2000 01:15:42 EST
>> >Subject: Re: More DIY EGOR
>> >To: diy_efi at diy-efi.org
>> >Reply-To: diy_efi at diy-efi.org
>> >
>> >From what I am understanding, yes & no.  there is not a sensor that
>measures
>> >the exhaust temp & sends that "temp" somewhere.  But, the resistance of
>the
>> >heater does change when the temp goes up & down.  This means that by
>> >"measuring" the current through the heater one can tell if the sensor is
>> >hotter (or colder) than it was a minute ago (not literal minute).
>> >
>> >This leads to the question, is it good enough for accurate measurements
>from
>> >the sensor in regards to O2 conc.?  I think that Bruce probably summed
>it up
>> >earlier (to paraphrase, if I may), it is good enough for tuning, but
>probably
>> >not for lab grade accuracy."
>> >
>> >BW


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